Výsledky vyhledávání - "K. P. Wellock"

Giant magnetoresistance of magnetic multilayer point contacts

Autor: J. Caro, K. P. Wellock, S. J. C. H. Theeuwen, B. J. Hickey, N. N. Gribov, Frans D. Tichelaar, S. Radelaar, R. P. van Gorkom, Christopher H. Marrows

Publikováno v: Physical Review B-Condensed Matter and Materials Physics, 60 (14)

We have studied the giant magnetoresistance ~GMR! in magnetic multilayer point contacts of three different types. The first generation contacts were made by deposition with molecular-beam epitaxy ~MBE! of an uncoupled Co/Cu multilayer on a pre-etched

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06bdb7dbd09f7c4153e6138ff3363f55
https://doi.org/10.1103/physrevb.60.10291

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Giant magnetoresistance of Co/Au multilayer point contacts

Autor: B. J. Hickey, J. Caro, K. P. Wellock

Publikováno v: Journal of Magnetism and Magnetic Materials. :27-29

We have measured the giant magnetoresistance (GMR) of granular Co/Au point contacts, fabricated by deposition of [Co(0.3 nm)/Au(4 nm)] 10 multilayers with molecular beam epitaxy. Two Co deposition rates were used to obtain two types of contacts with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1c4e51669faae4908d0a4a4b6e0d925d
https://doi.org/10.1016/s0304-8853(98)00608-8

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Role of boundary conditions and dimensions on the micromagnetics of a cobalt point contact

Autor: K. P. Wellock, R. P. van Gorkom, J. Caro, S. J. C. H. Theeuwen, N. N. Gribov, S. Radelaar

Publikováno v: Journal of Applied Physics. 85:6196-6198

We have calculated the micromagnetic structure of a Co point contact, for applied magnetic fields parallel (H∥) and perpendicular (H⊥) to the device’s electrodes. Different boundary conditions and dimensions have been examined. In most situatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6e2fad9f961431c077d31768ff1fb6f
https://doi.org/10.1063/1.370219

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Micromagnetics and magnetoresistance of a Permalloy point contact

Autor: R. P. van Gorkom, K. P. Wellock, N. N. Gribov, S. Radelaar, S. J. C. H. Theeuwen, J. Caro

Publikováno v: Applied Physics Letters. 74:422-424

We performed micromagnetic calculations for a Permalloy point contact. The magnetization configurations show the formation of a Neel wall in the constriction. The occurrence of a Neel wall instead of a Bloch wall results from the dipole–dipole ener

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3e4c8b27c48bdc46ef582ab3e28371e1
https://doi.org/10.1063/1.123048

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Using magnetoresistance to investigate magnetic interface anisotropy

Autor: K. P. Wellock, M.J. Walker, B. J. Hickey

Publikováno v: Journal of Applied Physics. 81:4476-4478

The ability to grow high quality thin metallic layers has brought about the discovery of the giant magnetoresistance (GMR) in multilayers and equally the perpendicular anisotropy exhibited by certain ferromagnetic thin films such as Co. In this artic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eea017829846efd60e59c624c08fea52
https://doi.org/10.1063/1.364983

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59Co nuclear magnetic resonance studies of interfacial defects in molecular beam epitaxy grown Co/Cu(111) multilayer

Autor: P. C. Riedi, B. J. Hickey, T. Thomson, K. P. Wellock

Publikováno v: Journal of Applied Physics. 81:4469-4471

59Co NMR and magnetotransport measurements have been undertaken on a series of molecular beam epitaxy grown Co 22 A/Cu 32 A(111) multilayers as a function of the number of repeat units in the multilayer stack. Examining the positions of the bulk [Co

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::03abebbc0fd8d0da958e3210066c9570
https://doi.org/10.1063/1.364980

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The effect of Au impurities at the interfaces on the magnetoresistance of MBE‐grown Co/Cu multilayers

Autor: B. J. Hickey, D. Greig, K. P. Wellock, M.J. Walker, Nathan Wiser, Jun Xu

Publikováno v: Journal of Applied Physics. 75:7055-7057

We have grown Co/Cu multilayers by MBE using a shuttering arrangement wherein half of the sample receives an amount of Au impurities at each interface. Under these controlled conditions, the differences in measurements between each half is attributed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::de236f5cbec71bb1efaaf7fb918cf421
https://doi.org/10.1063/1.356724

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The role of interface impurities in Co/Cu giant magnetoresistance multilayers

Autor: J. Xu, B. J. Hickey, M.J. Walker, Nathan Wiser, K. P. Wellock

Publikováno v: Journal of Magnetism and Magnetic Materials. :585-586

We have deposited impurities (Au, Ge and Cu) at the interface of Co/Cu multilayers grown by MBE. It was found that small fractions of a monolayer of impurities dramatically affect the GMR.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::536578b50b0ae522e83a790777eeafbe
https://doi.org/10.1016/0304-8853(94)01040-4

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The role of impurity scattering in Co/Cu (111) M.B.E. multilayers (abstract)

Autor: K. P. Wellock, B. J. Hickey

Publikováno v: Journal of Applied Physics. 79:5816

The origin of spin‐dependent scattering (sds) within magnetic/nonmagnetic systems is a controversial issue which has attracted much attention in recent years. There is now a consensus of opinion that sds is necessary for the giant magnetoresistance

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5b2f1846265dffc6912a7b0cf1563b11
https://doi.org/10.1063/1.362196

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